Go for a walk down 3rd road & check out clinics. Avoid Buakhao area, likely falang pay more....supply & demand stuff.
Nurse/receptionist will check blood pressure, temp, & weight.
Most docs will look at you, sign the paperwork and send you on your way without uttering a word. My doc said "you look fit".
Dress neatly & pay maximum of 200 baht.
Someone else may know an exact place?????????